TTFB: What Time To First Byte Is and Why It Matters for Site Performance
Alessandro Corbelli~6 min read min
What TTFB (Time To First Byte) is, why it affects user experience and SEO, what it depends on, and the general levers that help reduce it.
Blog
Technical notes on Linux, sysadmin, development and devops.
Cloudflare opens self-managed OAuth to every developer
Alessandro Corbelli~7 min read min
As of June 2026, anyone using Cloudflare can create their own OAuth clients with fine-grained permissions instead of broad API tokens. What it is, the problem it solves, and why it matters for people…
AWS Graviton5 and the new EC2 instances: why ARM chips in the cloud matter
Alessandro Corbelli~6 min read min
AWS has made its EC2 M9g and M9gd instances generally available, powered by the Graviton5 ARM processor. What changes and what to check before moving your Linux workloads onto them.
S3 disables SSE-C by default on new buckets: what changes and what to check
Alessandro Corbelli~6 min read min
Amazon S3 now disables customer-provided key encryption (SSE-C) by default on new buckets: what it is, why the default changed, and what to verify first.
TLS Encrypted Client Hello Becomes a Standard (RFC 9849)
Alessandro Corbelli~6 min read min
RFC 9849 makes Encrypted Client Hello a standard: it hides the site name that used to be visible during the TLS handshake. What changes for privacy, reverse proxies, CDNs, and SNI-based filtering.
Let's Encrypt: Six-Day Certificates and Certificates for IP Addresses
Alessandro Corbelli~7 min read min
As of 15 January 2026 Let's Encrypt offers everyone certificates valid for just over six days and certificates for IP addresses. What they are, why they matter, and what changes for people running…